Frequency of Neospora caninum infections in beef cow–calf operations under extensive management
The aim of this study was to evaluate the frequencies of Neospora caninum horizontal and vertical transmissions in beef cow–calf operations under three different extensive management systems: group A: 0.75 head per hectare pasturing on natural grass; group B: 1.1 head per hectare on natural grass an...
| Main Authors: | , , , , , , , , , , |
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| Format: | info:ar-repo/semantics/artículo |
| Language: | Inglés |
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2018
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| Online Access: | https://www.sciencedirect.com/science/article/pii/S0304401716300279 http://hdl.handle.net/20.500.12123/2738 https://doi.org/10.1016/j.vetpar.2016.02.002 |
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| author | Rodriguez, Alejandro Martin Maresca, Sebastian Cano, Dora Beatriz Armendano, Joaquín Ignacio Combessies, Gustavo Lopez Valiente, Sebastian Odriozola, Ernesto Raul Spath, Ernesto Juan Odeon, Anselmo Carlos Campero, Carlos Manuel Moore, Prando Dadin |
| author_browse | Armendano, Joaquín Ignacio Campero, Carlos Manuel Cano, Dora Beatriz Combessies, Gustavo Lopez Valiente, Sebastian Maresca, Sebastian Moore, Prando Dadin Odeon, Anselmo Carlos Odriozola, Ernesto Raul Rodriguez, Alejandro Martin Spath, Ernesto Juan |
| author_facet | Rodriguez, Alejandro Martin Maresca, Sebastian Cano, Dora Beatriz Armendano, Joaquín Ignacio Combessies, Gustavo Lopez Valiente, Sebastian Odriozola, Ernesto Raul Spath, Ernesto Juan Odeon, Anselmo Carlos Campero, Carlos Manuel Moore, Prando Dadin |
| author_sort | Rodriguez, Alejandro Martin |
| collection | INTA Digital |
| description | The aim of this study was to evaluate the frequencies of Neospora caninum horizontal and vertical transmissions in beef cow–calf operations under three different extensive management systems: group A: 0.75 head per hectare pasturing on natural grass; group B: 1.1 head per hectare on natural grass and improved cultured pastures; and group C: 2 head per hectare on natural grass, improved cultured pasture and whole corn silage. Serum samples from 72 multiparous cows assigned to each beef cow–calf operations were obtained every 3 months during 2 years. A group of 30 replacement heifers from each group were tested similarly since they were 10–21 months old. Twenty four, 20 and 34 calves from groups A, B and C respectively, were bled before colostrum intake and again 6 months later. The samples were analyzed by indirect fluorescence antibody test (IFAT) for detection of total IgG against N. caninum at a serological titre ≥200 for multiparous cows and replacement heifers, and a serological titre ≥25 for calves. Serum samples from seropositive cows were assessed by ELISA to evaluate the avidity of their specific antibodies. There were no differences in the proportion of seropositive cows from groups A, B and C at the beginning of the trial (p > 0.05). Interestingly, the lowest serological titres in seropositive cows from all groups were observed during the first trimester (p < 0.05). Although seropositive cows had medium to high avidity antibodies, suggesting chronic infection; seroconversion associated with low antibody avidity was found in 2, 3 and 3 seropositive cows from groups A, B and C. All replacement heifers remained seronegative. No abortions were recorded but 2, 1, and 2 calves from groups A, B and C were seropositive before colostrum intake, respectively. Seropositive calves born from cows having intermediate or high avidity remained with the same serostatus at 6 months of age. Even under varying extensive management conditions, both N. caninum horizontal and vertical transmission methods do occur in beef cow–calf operations. |
| format | info:ar-repo/semantics/artículo |
| id | INTA2738 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| record_format | dspace |
| spelling | INTA27382019-01-23T16:58:23Z Frequency of Neospora caninum infections in beef cow–calf operations under extensive management Rodriguez, Alejandro Martin Maresca, Sebastian Cano, Dora Beatriz Armendano, Joaquín Ignacio Combessies, Gustavo Lopez Valiente, Sebastian Odriozola, Ernesto Raul Spath, Ernesto Juan Odeon, Anselmo Carlos Campero, Carlos Manuel Moore, Prando Dadin Ganado de Carne Ternero Neospora caninum Manejo del Ganado Serología Enfermedades de los Animales Beef Cattle Calves Livestock Management Serology Animal Diseases The aim of this study was to evaluate the frequencies of Neospora caninum horizontal and vertical transmissions in beef cow–calf operations under three different extensive management systems: group A: 0.75 head per hectare pasturing on natural grass; group B: 1.1 head per hectare on natural grass and improved cultured pastures; and group C: 2 head per hectare on natural grass, improved cultured pasture and whole corn silage. Serum samples from 72 multiparous cows assigned to each beef cow–calf operations were obtained every 3 months during 2 years. A group of 30 replacement heifers from each group were tested similarly since they were 10–21 months old. Twenty four, 20 and 34 calves from groups A, B and C respectively, were bled before colostrum intake and again 6 months later. The samples were analyzed by indirect fluorescence antibody test (IFAT) for detection of total IgG against N. caninum at a serological titre ≥200 for multiparous cows and replacement heifers, and a serological titre ≥25 for calves. Serum samples from seropositive cows were assessed by ELISA to evaluate the avidity of their specific antibodies. There were no differences in the proportion of seropositive cows from groups A, B and C at the beginning of the trial (p > 0.05). Interestingly, the lowest serological titres in seropositive cows from all groups were observed during the first trimester (p < 0.05). Although seropositive cows had medium to high avidity antibodies, suggesting chronic infection; seroconversion associated with low antibody avidity was found in 2, 3 and 3 seropositive cows from groups A, B and C. All replacement heifers remained seronegative. No abortions were recorded but 2, 1, and 2 calves from groups A, B and C were seropositive before colostrum intake, respectively. Seropositive calves born from cows having intermediate or high avidity remained with the same serostatus at 6 months of age. Even under varying extensive management conditions, both N. caninum horizontal and vertical transmission methods do occur in beef cow–calf operations. EEA Cuenca del Salado Fil: Rodriguez, Alejandro Martin. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; Argentina Fil: Maresca, Sebastian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; Argentina Fil: Cano, Dora Beatriz. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina Fil: Armendano, Joaquín Ignacio. Universidad Nacional de Mar del Plata; Argentina Fil: Combessies, G. Laboratorio Azul; Argentina Fil: Lopez Valiente, Sebastian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; Argentina Fil: Odriozola, Ernesto Raul. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina Fil: Spath, Ernesto Juan. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina Fil: Odeon, Anselmo Carlos. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina Fil: Campero, Carlos Manuel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina Fil: Moore, Prando Dadin. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina 2018-07-06T13:35:38Z 2018-07-06T13:35:38Z 2016-03-30 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://www.sciencedirect.com/science/article/pii/S0304401716300279 http://hdl.handle.net/20.500.12123/2738 0304-4017 https://doi.org/10.1016/j.vetpar.2016.02.002 eng info:eu-repo/semantics/restrictedAccess application/pdf Veterinary Parasitology 219 : 40-43 (March 2016) |
| spellingShingle | Ganado de Carne Ternero Neospora caninum Manejo del Ganado Serología Enfermedades de los Animales Beef Cattle Calves Livestock Management Serology Animal Diseases Rodriguez, Alejandro Martin Maresca, Sebastian Cano, Dora Beatriz Armendano, Joaquín Ignacio Combessies, Gustavo Lopez Valiente, Sebastian Odriozola, Ernesto Raul Spath, Ernesto Juan Odeon, Anselmo Carlos Campero, Carlos Manuel Moore, Prando Dadin Frequency of Neospora caninum infections in beef cow–calf operations under extensive management |
| title | Frequency of Neospora caninum infections in beef cow–calf operations under extensive management |
| title_full | Frequency of Neospora caninum infections in beef cow–calf operations under extensive management |
| title_fullStr | Frequency of Neospora caninum infections in beef cow–calf operations under extensive management |
| title_full_unstemmed | Frequency of Neospora caninum infections in beef cow–calf operations under extensive management |
| title_short | Frequency of Neospora caninum infections in beef cow–calf operations under extensive management |
| title_sort | frequency of neospora caninum infections in beef cow calf operations under extensive management |
| topic | Ganado de Carne Ternero Neospora caninum Manejo del Ganado Serología Enfermedades de los Animales Beef Cattle Calves Livestock Management Serology Animal Diseases |
| url | https://www.sciencedirect.com/science/article/pii/S0304401716300279 http://hdl.handle.net/20.500.12123/2738 https://doi.org/10.1016/j.vetpar.2016.02.002 |
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